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Materials 2016, 9(6), 403; doi:10.3390/ma9060403

Fabrication of Gold-Coated Ultra-Thin Anodic Porous Alumina Substrates for Augmented SERS

1
Nanophysics Department, Istituto Italiano di Tecnologia, Genova 16163, Italy
2
Laboratoire de Physique des Interfaces et des Couches Minces (LPICM), Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique, Université Paris Saclay, Palaiseau 91128, France
3
Nanostructures Department Istituto Italiano, di Tecnologia, Genova 16163, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Fiedler
Received: 21 April 2016 / Revised: 17 May 2016 / Accepted: 19 May 2016 / Published: 24 May 2016
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Abstract

Anodic porous alumina (APA) is a nanostructured material used as a template in several nanotechnological applications. We propose the use of APA in ultra-thin form (<100 nm) for augmented surface-enhanced Raman scattering (SERS). Here, the effect of in-depth thinning of the APA nanostructures for possible maximization of SERS was addressed. Anodization was carried out on ultra-thin films of aluminum on glass and/or silicon, followed by pore-opening. Gold (Au) was overcoated and micro‑Raman/SERS measurements were carried out on test target analytes. Finite integration technique simulations of the APA-Au substrate were used both for the experimental design and simulations. It was observed that, under optimized conditions of APA and Au thickness, the SERS enhancement is higher than on standard APA-Au substrates based on thin (~100 nm) APA by up to a factor of ~20 for test molecules of mercaptobenzoic acid. The agreement between model and experimental results confirms the current understanding of SERS as being mainly due to the physical origin of plasmon resonances. The reported results represent one step towards micro-technological, integrated, disposable, high-sensitivity SERS chemical sensors and biosensors based on similar substrates. View Full-Text
Keywords: SERS; nanostructures; anodic porous alumina; mercaptobenzoic acid; enhancement; surface plasmons; hotspots SERS; nanostructures; anodic porous alumina; mercaptobenzoic acid; enhancement; surface plasmons; hotspots
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Toccafondi, C.; Proietti Zaccaria, R.; Dante, S.; Salerno, M. Fabrication of Gold-Coated Ultra-Thin Anodic Porous Alumina Substrates for Augmented SERS. Materials 2016, 9, 403.

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